CRUSTACEA FROM THE 'CHALLENGER' EXPEDITION. 59 



Pig. 2. First antenna. 



Fig. 3. Second antenna : s, scale ; /, flagellum. 



Fig. 4. First gnathopod. 



Fig. 5. Second gnatliopod. 



Figs. 6, 7. First and second pereiopods. 



Fig. 8. Last joints of the fourth pereiopod. 



Fig. 9. Maxilliped. 



Fig. 10. Willemoesia crucifera, x 4 nat. size. 



Plate XIII. 



Fig. 1. Willemoesia leptodactyla, male, nat. size. 



Fig. 2. First styliform pleopod. 



Fig. 3. Second pleopod of the right side : a, styliform appendage to the inner ramus. 



Fig. 4. Upper border of the opening of the mouth. 



Fig. 5. Mandibula, with the palpus (pm) and the left labium (lab). 



Fig. 6 a. First maxilla : ft, rudiment of a flagellum. 



Fig. 6 b. Second maxilla : fl, flagellum. 



Fig. 7. (First) maxilliped: p, palpus; fl 1 , upper half of the flagellum; fl' 2 , under half. 



Fig. 8. First gnathopod (second maxilliped) . 



Fig. 9. Second gnathopod (third maxilliped). 



Fig. 10. Second left pleopod of W. crucifera, with two styliform appendages. 



Fig. 11. Third right pleopod of the same, with one styliform appendage. 



Fig. 12. Second right pleopod of an undescribed Palinurid from deep water near the Bermudas. 



Wherever the words " high power " are not added, a low power of a Hartnack's microscope, or, hi 

 case it was not possible to dissect the animal, a loupe has been used. 



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